/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/ManagedArray.h
Reindex - Adjust index dependent elements. Offsets is the size of the dependent group; Final is post resize of dependent group used for bounds checking on remapped indices.
virtual void Reindex ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & Offsets, const int32 & FinalSize, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & SortedDeletionList, const [TSet](API\Runtime\Core\Containers\TSet)< int32 > & DeletionSet )